Skip to main content

Advertisement

Table 2 Characteristics of the study participants: analytic sample of the current study (N = 451)

From: Sex steroid metabolism polymorphisms and mammographic density in pre- and early perimenopausal women

  Mean SD Median Number %
Age at mammogram, years 48.6 2.6 48.7   
BMI, kg/m2 25.9 5.9 24.4   
   <25     251 56
   25–30     111 25
   >30     89 20
Percentage mammographic density 43.6 19.5 44.7   
Age at first full-term birth 28.1 5.5 28.0   
Ethnicity      
   African American     26 6
   White     219 49
   Chinese     109 24
   Japanese     97 22
Study site      
   Oakland     184 41
   Los Angeles     169 37
   Pittsburgh     98 22
Smoking currently     31 7
Menopausal status at time of mammogram      
   Early perimenopausal     332 74
   Premenopausal     118 26
Parity      
   0     77 17
   1     76 17
   2     196 43
   3     76 17
   4     19 4
   ≥ 5     7 2
  1. Baseline menopause stage information was missing for one participant whose baseline mammogram was chosen; the participant was early perimenopausal at the subsequent (first annual) visit.